Revealing mistake: In the middle of the episode Spock goes to Plack Tao to meditate. We see a shot of him and then we see some other people. At this moment look directly behind all of them and you will see Spock waiting for his next shot.
Continuity mistake: When Spock and Captain Kirk are fighting with the lirpa, watch Kirk closely after he has been slashed by Spock and his shirt ripped. Both the ripped shirt and scar appear and disappear throughout the rest of the fight.
Continuity mistake: Just before T'Pring calls for the challenge, there's a wide shot of her going toward the gong. Then they cut to a closeup and she is standing beside Stonn, and then she starts moving toward the gong again.